Tube



FIG. 1 is a perspective front side view of a tube of the present invention;

FIG. 2 is front side view of the tube;

FIG. 3 is a back side view of the tube;

FIG. 4 is a right side view of the tube;

FIG. 5 is a left side view of the tube;

FIG. 6 is a top side view of the tube; and,

FIG. 7 is a bottom side view of the tube.

Portions shown in dashed lines do not form part of the claimed invention. 

The ornamental design for a tube, as shown and described. 